Frequencies for first 10,000 rows of rollover variable in person dataset :

   Rollover |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,051       70.51       70.51
          1 |        841        8.41       78.92
          2 |      1,287       12.87       91.79
          . |        821        8.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016